Fe + O2 à Fe2O3 1. How many moles of iron (lll) oxide are produced from 0.275 moles of diatomic oxygen?

2. How many moles of iron are required to react with 0.275 moles of diatomic oxygen?

C4H10 + O2 à CO2 + H2O

3. How many grams of butane (C4H10) are required to burn 3.63 moles of oxygen?

4. How many moles of carbon dioxide are produced if 9.45 moles of water are also produced?

5. How many moles of butane are required to react with 0.25 moles of oxygen?

6. How many grams of oxygen are required to produce 13.9 g of carbon dioxide?

answer is a

explanation:

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.